Polyphosphazene-modified cellular polyurethane elastomer and preparation method thereof

Abstract

The invention discloses a polyphosphazene-modified cellular polyurethane elastomer and a preparation method thereof. The method comprises the following steps: 1, reacting excessive isocyanate and polymer polyol at the temperature of 100-150 DEG C for 30-120 minutes to generate a prepolymer of which the molecular chain end is -NCO radical; 2, performing chain extension by adopting a full-polymerization method, mixing the prepolymer and a chain extender component in the ratio of 100:(3-12), stirring at the speed of not less than 1,000 revolutions per minute for 5-30 seconds, rapidly injecting a feed liquid into a mold of which the temperature is 60-100 DEG C, pre-curing for 10-60 minutes and demolding; and 3, placing a demolded product into a drying oven of which the temperature is 80-120 DEG C, and continually curing for 6-12 hours. The cellular polyurethane elastomer prepared through the method has superior damping and buffering properties and superior moisture and aging resistance, and is mainly applied to high-strength damping elements capable of bearing dynamic fatigue in severe environments, vibration-damping and noise-reducing elements capable of bearing aging on wet-hot weather on ships and the like, as well as railway gaskets, automobile damping springs, elevator damping blocks and bridge damping blocks for use in tropical zones.

Description

[0001] technical field

[0002] The invention relates to a preparation method of polyurethane microporous elastomer, especially a linear phenoxyphosphazene oligomer containing hydroxyl as polymer polyol segment, 1,5-naphthalene diisocyanate (NDI) as hard The invention relates to a microporous elastomer capable of both excellent dynamic mechanical properties and moisture-heat aging resistance and a preparation method thereof. Background technique

[0003] Polyurethane microcellular elastomer has low density, excellent dynamic mechanical properties and static mechanical properties. It is a widely used industrial damping system component. Vibration and noise reduction devices and elevator safety components, etc. At present, the polyurethane microcellular elastomers used in the field of shock absorption and buffering are mainly divided into two categories: polyester polyurethane microcellular elastomers and polyether polyurethane microcellular elastomers. Polyester polyurethan...

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